"Juuyonsai no Haha" promotional trailer

There's a promotional trailer of "Juuyonsai no Haha" starring Shida Mirai which lasts for about 15 secs. In the clip, Shida is lying on a bed in this black-and-white setting and the posture seems to be in reference to that of a baby residing in his/her mother's womb. Since the drama is about teen pregnancy, this could be why Shida was arranged to appear in such a manner for the CM.